One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(5,6,10,8)(7,12,9,11)(13,14,18,20)(15,19,17,16)(21,22)(23,27)(24,25)(26,28)(2,3)(5,7)(6,11)(8,12)(9,10)(13,15)(14,16)(17,18)(19,20)(22,24)(26,27) involution — undirected(5,6,10,8)(7,12,9,11)(13,16)(14,17)(15,20)(18,19)(21,22,25,24)(23,26,28,27)(2,3)(5,8,10,6)(7,12,9,11)(13,16)(14,15)(17,20)(18,19)(21,23)(22,26)(24,27)(25,28)(1,3,4,2)(5,9,10,7)(6,11,8,12)(13,17,18,15)(14,19,20,16)(21,24,25,22)(23,26,28,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.